Greetings,

The easiest way to do this is as follows, it depends on where you
locate
your DAS object, by default it will only search the current container
for
user objects, unless you have Username Resolution setup in the DAS.
Therefore have no users in the DAS object container and disable
Username
Resolution in the DAS object. Users are then required to use their
full
NDS details to login, be advised this may increase your administration
of
lower containers etc for RADIUS authentication

Regards,

BM